ASMT-CW40 Equivalent & Substitute Parts

Part Overview

The ASMT-CW40 is a white LED indication component in a 2-SMD, No Lead surface mount right-angle package. This part is classified as Obsolete, making substitute components necessary for new designs and ongoing production requirements. The ASMT-CW40 features a diffused white lens with a 1.10mm x 0.30mm lens size and operates at a typical forward voltage of 2.9V with a 115mcd brightness rating.

Substiute Parts

ASMT-CW40

Broadcom LimitedIn Stock: 4122ASMT-CW40 Datasheet

Current PartRFQ

ASMT-CW00

Broadcom LimitedIn Stock: 16472ASMT-CW00 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ASMT-CW40 is based on the following critical parameters that must remain compatible:

• Color: White
• Mounting Type: Surface Mount, Right Angle
• Package / Case: 2-SMD, No Lead
• Voltage - Forward (Vf) (Typ): Within acceptable operating range (2.85V to 2.9V)
• Current - Test: 5mA
• Viewing Angle: 150°
• Base Product Number: ASMT-C series

The ASMT-CW00 qualifies as a direct substitute based on these parameters. While the ASMT-CW00 features a clear lens with a domed top (versus the diffused flat-top lens of the ASMT-CW40) and a lower brightness rating (35mcd versus 115mcd), it maintains electrical compatibility through matching forward voltage, test current, viewing angle, and mounting configuration. Both components share the same 2-SMD, No Lead package footprint and base product number designation.

Parameter Comparison

Engineering Selection Recommendations

The ASMT-CW00 is the manufacturer-recommended substitute for the obsolete ASMT-CW40. Selection of the ASMT-CW00 is supported by:

• Active product status, ensuring long-term availability and supply chain continuity
• RoHS3 compliance certification, meeting current environmental and regulatory standards
• Identical electrical parameters (forward voltage, test current, viewing angle)
• Identical mounting configuration and package footprint (2-SMD, No Lead)
• Identical moisture sensitivity level and regulatory compliance (REACH Unaffected, EAR99)

Design considerations include the difference in lens transparency (clear versus diffused) and brightness output (35mcd versus 115mcd). The ASMT-CW00's increased maximum height (0.45mm versus 0.30mm) must be evaluated against PCB layout constraints and mechanical clearance requirements.

Frequently Asked Questions (FAQ)

Q: Can the ASMT-CW00 be used as a direct replacement for the ASMT-CW40 in existing designs?

A: The ASMT-CW00 is electrically compatible with the ASMT-CW40 and shares the same 2-SMD, No Lead package footprint. However, the increased height (0.45mm versus 0.30mm) and different lens characteristics (clear versus diffused) must be evaluated for your specific application. PCB layout and mechanical clearance should be verified before implementation.

Q: What are the key differences between the ASMT-CW40 and ASMT-CW00?

A: The primary differences are: lens transparency (diffused versus clear), brightness rating (115mcd versus 35mcd), maximum height (0.30mm versus 0.45mm), and product status (obsolete versus active). Electrical parameters including forward voltage, test current, and viewing angle remain compatible.

Q: Why is the ASMT-CW40 classified as obsolete?

A: The ASMT-CW40 has been discontinued by Broadcom Limited. The ASMT-CW00 is the active product offering within the ASMT-C series for white LED indication applications in surface mount right-angle configurations.

Q: Are there any compliance or regulatory differences between these parts?

A: Both components share identical regulatory compliance: REACH Unaffected status and EAR99 ECCN classification. The ASMT-CW00 carries RoHS3 compliance certification, which is current environmental standard compliance.

Q: What is the impact of the lens transparency difference on application performance?

A: The ASMT-CW40 features a diffused lens, which disperses light more uniformly. The ASMT-CW00 features a clear lens, which produces more directional light output. The choice depends on whether your application requires diffused or directional illumination characteristics.